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Suffix letter
Hi,
As far as it is known, the suffix letter 'A' up to 1962 was is refering to:
Armament for unarmed aircraft
Arrester gear
Amphibian
LAnd-based
USAAF contract.
F4U-1A is not official, but F4U-1C is official as suffix 'C' refers to a cannon-version of a type.
All USN suffixes letters are available on many sites.
Phil
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